Definition
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Trapezoid is a quadrilateral with one pair of parallel opposite sides





Properties

Angle Properties

1. *Consecutive angles are supplementary
*This property applies only to the indicated pairs of consecutive angles below (Angle RTP & Angle TPA, Angle TRA & Angle RAP)

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Example Proof:
Prove: Angle RAP and Angle TRA are supplementary

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This is the most important property of a trapezoid for the following reasons:
- Given only one angle measurement from the two consecutive angle pair, the other angle measurement can be known using this property